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                    12.面试题一
            
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                    2.hashMap底层原理
            
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                    三种工厂模式
            
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                    实战工厂模式
            
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                    实战抽象工厂模式
            
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                    1.mysql索引基础之b树与b+树⭐⭐
            
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                    2.mysql索引及优化⭐⭐⭐⭐
            
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                    3.mysql存储引擎.md
            
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                    4.多版本并发控制之mvcc原理
            
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                    5.mysql事务
            
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                    3.服务降级
            
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<ol>
<li>&#x7ED9;&#x5BF9;&#x8C61;&#x5206;&#x914D;&#x5185;&#x5B58;</li>
<li>&#x56DE;&#x6536;&#x5206;&#x914D;&#x7ED9;&#x5BF9;&#x8C61;&#x7684;&#x5185;&#x5B58;</li>
</ol>
<p>&#x5BF9;&#x8C61;&#x7684;&#x5185;&#x5B58;&#x5206;&#x914D;&#xFF0C;&#x4ECE;&#x5927;&#x4F53;&#x4E0A;&#x8BB2;&#xFF0C;&#x5C31;&#x662F;&#x5728;&#x5806;&#x5185;&#x5B58;&#x4E2D;&#x8FDB;&#x884C;&#x5206;&#x914D;&#xFF0C;&#x5BF9;&#x8C61;&#x4E3B;&#x8981;&#x662F;&#x5206;&#x914D;&#x5728;&#x65B0;&#x751F;&#x4EE3;&#x7684;Eden&#x533A;&#x4E0A;&#xFF0C;&#x5982;&#x679C;&#x542F;&#x52A8;&#x4E86;&#x672C;&#x5730;&#x7EBF;&#x7A0B;&#x5206;&#x914D;&#x7F13;&#x51B2;&#xFF08;TLAB&#xFF09;&#xFF0C;&#x5219;&#x5C06;&#x6309;&#x7EBF;&#x7A0B;&#x4F18;&#x5148;&#x5728;TLAB&#x4E0A;&#x5206;&#x914D;&#x3002;&#x5C11;&#x6570;&#x60C5;&#x51B5;&#x4E5F;&#x4F1A;&#x76F4;&#x63A5;&#x5206;&#x914D;&#x5728;&#x8001;&#x5E74;&#x4EE3;&#x4E2D;&#xFF0C;&#x5206;&#x914D;&#x7684;&#x89C4;&#x5219;&#x4E0D;&#x662F;&#x767E;&#x5206;&#x4E4B;&#x767E;&#x56FA;&#x5B9A;&#x7684;&#xFF0C;&#x7EC6;&#x8282;&#x53D6;&#x51B3;&#x4E8E;&#x5F53;&#x524D;&#x4F7F;&#x7528;&#x7684;&#x662F;&#x54EA;&#x4E00;&#x79CD;&#x5783;&#x573E;&#x6536;&#x96C6;&#x5668;&#x7EC4;&#x5408;&#xFF0C;&#x8FD8;&#x6709;&#x865A;&#x62DF;&#x673A;&#x4E2D;&#x4E0E;&#x5185;&#x5B58;&#x76F8;&#x5173;&#x7684;&#x53C2;&#x6570;&#x7684;&#x8BBE;&#x7F6E;&#x3002;</p>
<p>&#x4E00;&#x4E0B;&#x662F;&#x51E0;&#x6761;&#x6700;&#x666E;&#x904D;&#x7684;&#x5185;&#x5B58;&#x5206;&#x914D;&#x89C4;&#x5219;&#x3002;</p>
<hr>
<h3 id="1&#x5BF9;&#x8C61;&#x4F18;&#x5148;&#x5728;eden&#x5206;&#x914D;"><a name="1&#x5BF9;&#x8C61;&#x4F18;&#x5148;&#x5728;eden&#x5206;&#x914D;" class="anchor-navigation-ex-anchor" href="#1&#x5BF9;&#x8C61;&#x4F18;&#x5148;&#x5728;eden&#x5206;&#x914D;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="1&#x5BF9;&#x8C61;&#x4F18;&#x5148;&#x5728;eden&#x5206;&#x914D;" class="plugin-anchor" href="#1&#x5BF9;&#x8C61;&#x4F18;&#x5148;&#x5728;eden&#x5206;&#x914D;"><i class="fa fa-link" aria-hidden="true"></i></a>1.&#x5BF9;&#x8C61;&#x4F18;&#x5148;&#x5728;Eden&#x5206;&#x914D;</h3>
<p>&#x5927;&#x591A;&#x6570;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x5BF9;&#x8C61;&#x5728;&#x65B0;&#x751F;&#x4EE3;&#x7684;Eden&#x533A;&#x4E2D;&#x5206;&#x914D;&#x3002;&#x5F53;Eden&#x533A;&#x4E2D;&#x6CA1;&#x6709;&#x8DB3;&#x591F;&#x7684;&#x5185;&#x5B58;&#x7A7A;&#x95F4;&#x8FDB;&#x884C;&#x5206;&#x914D;&#x65F6;&#xFF0C;&#x865A;&#x62DF;&#x673A;&#x5C06;&#x53D1;&#x8D77;&#x4E00;&#x6B21;MinorGC(&#x65B0;&#x751F;&#x4EE3;GC&#xFF0C;&#x5206;&#x914D;&#x7387;&#x8D8A;&#x9AD8;&#xFF0C;MinorGC&#x8D8A;&#x9891;&#x7E41;&#xFF0C;&#x4F46;&#x662F;&#x56DE;&#x6536;&#x901F;&#x5EA6;&#x4E00;&#x822C;&#x4E5F;&#x6BD4;&#x8F83;&#x5FEB;&#xFF09;&#x3002;</p>
<p>&#x6D4B;&#x8BD5;&#x4EE3;&#x7801;&#xFF1A;</p>
<pre><code class="lang-java"><span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> int_1MB = <span class="hljs-number">1024</span> * <span class="hljs-number">1024</span>;

<span class="hljs-comment">/**
 * VM&#x53C2;&#x6570;&#xFF1A;-verbose:gc -Xms20M -Xmx20M -Xmn10M -xx:+PrintGCDetails -xx:SurvivorRatio=8
*/</span>

<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">testAllocataion</span><span class="hljs-params">()</span></span>{
    <span class="hljs-keyword">byte</span>[] allocation,allocation2,allocation3,allocation4;
    allocation <span class="hljs-number">1</span> = <span class="hljs-keyword">new</span> <span class="hljs-keyword">byte</span>[<span class="hljs-number">2</span> * _1MB];
    allocation <span class="hljs-number">2</span> = <span class="hljs-keyword">new</span> <span class="hljs-keyword">byte</span>[<span class="hljs-number">2</span> * _1MB];
    allocation <span class="hljs-number">3</span> = <span class="hljs-keyword">new</span> <span class="hljs-keyword">byte</span>[<span class="hljs-number">2</span> * _1MB];
    allocation <span class="hljs-number">4</span> = <span class="hljs-keyword">new</span> <span class="hljs-keyword">byte</span>[<span class="hljs-number">4</span> * _1MB];        <span class="hljs-comment">//&#x51FA;&#x73B0;&#x4E00;&#x5904;MinorGC</span>
}
</code></pre>
<p>&#x5B9E;&#x9A8C;&#x53C2;&#x6570;&#x8BBE;&#x7F6E;&#xFF1A;</p>
<p>-Xms20M  -Xmx20M  -Xmn10M&#x8FD9;&#x4E09;&#x4E2A;&#x53C2;&#x6570;&#x9650;&#x5236;&#x4E86;Java&#x5806;&#x7684;&#x5927;&#x5C0F;&#x4E3A;20M&#x4E14;&#x4E0D;&#x53EF;&#x6269;&#x5C55;&#xFF0C;&#x5176;&#x4E2D;10M&#x5206;&#x7ED9;&#x65B0;&#x751F;&#x4EE3;&#xFF0C;10M&#x5206;&#x914D;&#x7ED9;&#x6765;&#x5E74;&#x4EE3;</p>
<p>-xx:SurvivorRatio=8 &#x786E;&#x5B9A;&#x4E86;&#x65B0;&#x751F;&#x4EE3;&#x4E2D;Eden&#x533A;&#x4E0E;Survivor&#x533A;&#x7684;&#x7A7A;&#x95F4;&#x6BD4;&#x4F8B;&#x662F;8:1&#xFF08;&#x65B0;&#x751F;&#x4EE3;&#x4E2D;&#x6709;&#x4E24;&#x4E2A;Survivor&#x533A;&#xFF09;</p>
<p>&#x5B9E;&#x9A8C;&#x7ED3;&#x679C;&#xFF1A;</p>
<p>testAllocation()&#x65B9;&#x6CD5;&#x6267;&#x884C;&#xFF0C;&#x5728;&#x5206;&#x914D;allocation4&#x5BF9;&#x8C61;&#x65F6;&#x4F1A;&#x89E6;&#x53D1;&#x4E00;&#x6B21;MinorGC&#xFF0C;&#x539F;&#x56E0;&#x662F;&#x5728;&#x7ED9;allocation4&#x5206;&#x914D;&#x5BF9;&#x8C61;&#x65F6;&#x5019;&#xFF0C;&#x53D1;&#x73B0;Eden&#x533A;&#x57DF;&#x5DF2;&#x7ECF;&#x88AB;&#x5360;&#x7528;&#x4E86;6MB&#xFF0C;&#x5269;&#x4F59;&#x7A7A;&#x95F4;&#x65E0;&#x6CD5;&#x5BB9;&#x7EB3;allocation4&#x5BF9;&#x8C61;&#x7684;4MB&#x5185;&#x5B58;&#x3002;GC&#x671F;&#x95F4;&#x865A;&#x62DF;&#x673A;&#x53C8;&#x53D1;&#x73B0;&#x5DF2;&#x7ECF;&#x5206;&#x914D;&#x7684;3&#x4E2A;&#x5927;&#x5C0F;&#x4E3A;2MB&#x7684;&#x5BF9;&#x8C61;&#x5168;&#x90E8;&#x65E0;&#x6CD5;&#x653E;&#x5165;Survivor&#x7A7A;&#x95F4;&#x4E2D;&#xFF08;&#x56E0;&#x4E3A;Survivor&#x7A7A;&#x95F4;&#x53EA;&#x6709;1MB&#xFF09;&#xFF0C;&#x6240;&#x4EE5;&#x53EA;&#x80FD;&#x901A;&#x8FC7;&#x5206;&#x914D;&#x62C5;&#x4FDD;&#x673A;&#x5236;&#x5C06;&#x8FD9;&#x4E09;&#x4E2A;&#x5BF9;&#x8C61;&#x63D0;&#x524D;&#x8F6C;&#x79FB;&#x5230;&#x8001;&#x5E74;&#x4EE3;&#x4E2D;&#xFF0C;&#x800C;MinorGC&#x540E;allocation4&#x5BF9;&#x8C61;&#x5C06;&#x5206;&#x914D;&#x5230;Eden&#x533A;&#x57DF;&#x3002;</p>
<p>GC&#x7ED3;&#x675F;&#x540E;&#x5185;&#x5B58;&#x5206;&#x914D;&#x60C5;&#x51B5;&#xFF1A;Eden&#x5360;&#x7528;4MB(allocation4&#xFF09;&#xFF0C;Survivor&#x7A7A;&#x95F2;&#xFF0C;&#x8001;&#x5E74;&#x4EE3;&#x5360;&#x7528;6MB&#xFF08;allocation1&#x3001;2&#x3001;3&#xFF09;</p>
<h3 id="2&#x3001;&#x5927;&#x5BF9;&#x8C61;&#x76F4;&#x63A5;&#x8FDB;&#x5165;&#x8001;&#x5E74;&#x4EE3;"><a name="2&#x3001;&#x5927;&#x5BF9;&#x8C61;&#x76F4;&#x63A5;&#x8FDB;&#x5165;&#x8001;&#x5E74;&#x4EE3;" class="anchor-navigation-ex-anchor" href="#2&#x3001;&#x5927;&#x5BF9;&#x8C61;&#x76F4;&#x63A5;&#x8FDB;&#x5165;&#x8001;&#x5E74;&#x4EE3;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="2&#x3001;&#x5927;&#x5BF9;&#x8C61;&#x76F4;&#x63A5;&#x8FDB;&#x5165;&#x8001;&#x5E74;&#x4EE3;" class="plugin-anchor" href="#2&#x3001;&#x5927;&#x5BF9;&#x8C61;&#x76F4;&#x63A5;&#x8FDB;&#x5165;&#x8001;&#x5E74;&#x4EE3;"><i class="fa fa-link" aria-hidden="true"></i></a>2&#x3001;&#x5927;&#x5BF9;&#x8C61;&#x76F4;&#x63A5;&#x8FDB;&#x5165;&#x8001;&#x5E74;&#x4EE3;</h3>
<p>&#x6240;&#x8C13;&#x7684;&#x5927;&#x5BF9;&#x8C61;&#x5C31;&#x662F;&#x6307;&#xFF0C;&#x9700;&#x8981;&#x5927;&#x91CF;&#x8FDE;&#x7EED;&#x5185;&#x5B58;&#x7A7A;&#x95F4;&#x7684;Java&#x5BF9;&#x8C61;&#xFF0C;&#x6700;&#x5178;&#x578B;&#x7684;&#x5927;&#x5BF9;&#x8C61;&#x5C31;&#x662F;&#x90A3;&#x79CD;&#x5F88;&#x957F;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x4EE5;&#x53CA;&#x6570;&#x7EC4;&#xFF08;&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#x7684;byte[]&#x6570;&#x7EC4;&#x5C31;&#x662F;&#x5178;&#x578B;&#x7684;&#x5927;&#x5BF9;&#x8C61;&#xFF09;&#x3002;&#x5927;&#x5BF9;&#x8C61;&#x5BF9;&#x865A;&#x62DF;&#x673A;&#x7684;&#x5185;&#x5B58;&#x5206;&#x914D;&#x6765;&#x8BF4;&#x662F;&#x4E00;&#x4E2A;&#x574F;&#x6D88;&#x606F;&#xFF08;&#x7279;&#x522B;&#x662F;&#x201C;&#x671D;&#x751F;&#x5915;&#x706D;&#x201D;&#x7684;&#x201C;&#x77ED;&#x547D;&#x5927;&#x5BF9;&#x8C61;&#x201D;&#xFF0C;&#x5199;&#x7A0B;&#x5E8F;&#x65F6;&#x5E94;&#x8BE5;&#x907F;&#x514D;&#xFF09;&#xFF0C;&#x7ECF;&#x5E38;&#x51FA;&#x73B0;&#x5927;&#x5BF9;&#x8C61;&#x5BB9;&#x6613;&#x5BFC;&#x81F4;&#x5185;&#x5B58;&#x8FD8;&#x6709;&#x4E0D;&#x5C11;&#x7A7A;&#x95F4;&#x65F6;&#x5C31;&#x8981;&#x63D0;&#x524D;&#x89E6;&#x53D1;&#x5783;&#x573E;&#x6536;&#x96C6;&#x4EE5;&#x83B7;&#x53D6;&#x8DB3;&#x591F;&#x7684;&#x8FDE;&#x7EED;&#x7A7A;&#x95F4;&#x6765;&#x5B89;&#x7F6E;&#x5B83;&#x4EEC;&#x3002;</p>
<p>&#x865A;&#x62DF;&#x673A;&#x63D0;&#x4F9B;&#x4E86;&#x4E00;&#x4E2A;-XX:PretenureSizeThreshold&#x53C2;&#x6570;&#xFF0C;&#x76EE;&#x7684;&#x662F;&#x5F53;&#x5206;&#x914D;&#x5927;&#x4E8E;&#x8FD9;&#x4E2A;&#x503C;&#x7684;&#x5BF9;&#x8C61;&#x65F6;&#xFF0C;&#x76F4;&#x63A5;&#x5728;&#x8001;&#x5E74;&#x4EE3;&#x4E2D;&#x5206;&#x914D;&#x3002;&#x8FD9;&#x6837;&#x505A;&#x7684;&#x76EE;&#x7684;&#x662F;&#x907F;&#x514D;&#x5728;Eden&#x533A;&#x4EE5;&#x53CA;&#x4E24;&#x4E2A;Survivor&#x533A;&#x4E4B;&#x95F4;&#x53D1;&#x751F;&#x5927;&#x91CF;&#x7684;&#x5185;&#x5B58;&#x590D;&#x5236;&#x3002;</p>
<h3 id="3&#x3001;&#x957F;&#x671F;&#x5B58;&#x6D3B;&#x7684;&#x5BF9;&#x8C61;&#x8FDB;&#x5165;&#x8001;&#x5E74;&#x4EE3;"><a name="3&#x3001;&#x957F;&#x671F;&#x5B58;&#x6D3B;&#x7684;&#x5BF9;&#x8C61;&#x8FDB;&#x5165;&#x8001;&#x5E74;&#x4EE3;" class="anchor-navigation-ex-anchor" href="#3&#x3001;&#x957F;&#x671F;&#x5B58;&#x6D3B;&#x7684;&#x5BF9;&#x8C61;&#x8FDB;&#x5165;&#x8001;&#x5E74;&#x4EE3;"><i class="fa fa-link" aria-hidden="true"></i></a><a name="3&#x3001;&#x957F;&#x671F;&#x5B58;&#x6D3B;&#x7684;&#x5BF9;&#x8C61;&#x8FDB;&#x5165;&#x8001;&#x5E74;&#x4EE3;" class="plugin-anchor" href="#3&#x3001;&#x957F;&#x671F;&#x5B58;&#x6D3B;&#x7684;&#x5BF9;&#x8C61;&#x8FDB;&#x5165;&#x8001;&#x5E74;&#x4EE3;"><i class="fa fa-link" aria-hidden="true"></i></a>3&#x3001;&#x957F;&#x671F;&#x5B58;&#x6D3B;&#x7684;&#x5BF9;&#x8C61;&#x8FDB;&#x5165;&#x8001;&#x5E74;&#x4EE3;</h3>
<p>&#x65E2;&#x7136;&#x865A;&#x62DF;&#x673A;&#x91C7;&#x7528;&#x4E86;&#x5206;&#x4EE3;&#x6536;&#x96C6;&#x7684;&#x601D;&#x60F3;&#x6765;&#x7BA1;&#x7406;&#x5185;&#x5B58;&#xFF0C;&#x90A3;&#x4E48;&#x5185;&#x5B58;&#x56DE;&#x6536;&#x65F6;&#x5C31;&#x5FC5;&#x987B;&#x80FD;&#x8BC6;&#x522B;&#x54EA;&#x4E9B;&#x5BF9;&#x8C61;&#x5E94;&#x653E;&#x5728;&#x65B0;&#x751F;&#x4EE3;&#xFF0C;&#x54EA;&#x4E9B;&#x5BF9;&#x8C61;&#x5E94;&#x653E;&#x5728;&#x8001;&#x5E74;&#x4EE3;&#x3002;&#x4E3A;&#x4E86;&#x505A;&#x5230;&#x8FD9;&#x70B9;&#xFF0C;&#x865A;&#x62DF;&#x673A;&#x7ED9;&#x6BCF;&#x4E2A;&#x5BF9;&#x8C61;&#x5B9A;&#x4E49;&#x4E86;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x5E74;&#x9F84;&#x8BA1;&#x6570;&#x5668;,&#x4FDD;&#x5B58;&#x5728;&#x5BF9;&#x8C61;&#x5934;&#x79CD;&#x3002;</p>
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